Thermistor Check - Hoshizaki KM-301BAJ Service Manual

F. Thermistor Check
To check thermistor resistance, follow the steps below.
1) Unplug the icemaker from the electrical outlet.
2) Remove the louver, then move the control switch to the "OFF" position.
3) Remove the top panel.
4) Remove the thermistor from the refrigerant tubing.
5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.
6) From the compressor area, locate the thermistor/CB connector protective plastic bundle.
Open the protective plastic bundle and remove the thermistor/CB connector from the
protective plastic bundle.
7) Disconnect the thermistor connector from CB connector and check the resistance
between thermistor leads. Normal range is 4.7 to 6.2 kΩ. If outside the normal range,
replace the thermistor. See "IV.B. Component Service Information." If within the normal
range, continue to the next step.
8) Replace the thermistor in its correct position. See "IV.B. Component Service
Information."
9) Reconnect the thermistor connector to CB connector and re-secure in the protective
plastic cover.
10) Replace the top panel in its correct position.
11) Plug the icemaker into the electrical outlet, then move the control switch to the "ICE"
position to start the automatic icemaking process.
12) Replace the louver in its correct position.
13) Once the harvest cycle starts (Comp energizes), begin timing the harvest cycle.
14) The harvest timer and harvest cycle should terminate within 2 to 5 min. If the harvest
cycle does not terminate within 2 to 5 min., replace CB.
Legend: CB–control board; Comp–compressor
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